21431230133 has 4 divisors (see below), whose sum is σ = 21527334528. Its totient is φ = 21335125740.

The previous prime is 21431230129. The next prime is 21431230147. The reversal of 21431230133 is 33103213412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21431230133 - 2² = 21431230129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21431230099 and 21431230108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431230103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48051863 + ... + 48052308.

It is an arithmetic number, because the mean of its divisors is an integer number (5381833632).

Almost surely, 2^21431230133 is an apocalyptic number.

It is an amenable number.

21431230133 is a deficient number, since it is larger than the sum of its proper divisors (96104395).

21431230133 is an equidigital number, since it uses as much as digits as its factorization.

21431230133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96104394.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21431230133 its reverse (33103213412), we get a palindrome (54534443545).

The spelling of 21431230133 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty thousand, one hundred thirty-three".